The Snake Pit (1948, Olivia de Havilland, Mark Stevens)

Lester May notes: "Just after ten minutes into this film, there is an unusual double-decker bus - fleet number 2003 of the Chicago Motor Coach Company. It is quite 'futuristic' in design. Right at the very end of the film, a hospital bus/coach is seen." Fans of the original The Day the Earth Stood Still will recognise the 'decker as the unique prototype 1933-built Yellow Coach Model 706 'Queen Mary', a revolutionary 72-seat rear engined design.
It was fleet number 103 with the Chicago Motor Coach Company, but here and in The Day the Earth Stood Still and On The Town it was disguised as Fifth Avenue Coach Company bus 2003. It was wrecked by fire a few years ago at a museum in California. (identification by Malcolm Thwaite)